下列说法不正确的是( ) A.电解水可以得到氧气,是因为水中含有溶解的氧气 B.

题型:选择题

问题:

下列说法不正确的是(  )

A.电解水可以得到氧气,是因为水中含有溶解的氧气

B.电解水制取氢气要消耗大量电能,应该寻找更好的方法使水分解出氢气

C.燃放烟花爆竹产生的物质会对空气造成污染

D.任意排放工业废水和生活污水,滥用化肥和农药,都会导致水体污染

考点:电解水实验水污染与防治空气的污染和防治
题型:选择题

阅读理解。

     A traveler was once staying in a village of another country. One day, she held up her camera to take

pictures of the children at play. Suddenly the young ones began to shout in protest (反对). 

    The traveller's face turned red and she said sorry to the head for what she was doing, and told him

she had forgotten that people in some places thought a person would lose his soul (灵魂) if his picture

was taken. 

     She explained (解释) to him the operation of a camera for a long time. Several times the head tried

to say something, but he couldn't. 

     When she was sure she had put the head's fear (害怕) to rest, the traveler then let him speak. With

a smile, he said, "The children were trying to tell you that you forgot to take off the cap (镜头盖)!"

1. The children shouted when the traveler was taking pictures of them because ______. [ ]

A. they didn't want to have their pictures taken

B. The traveler was not doing well with her camera

C. They didn't want to stop playing

D. The traveler forgot to take off the cap on her head

2. The traveler said sorry to the head because ______. [ ]

A. she thought it was not right to take people's pictures without telling them beforehand (事先)

B. the children would lose their souls

C. she had stayed in the village too long

D. she didn't take a picture of the head first

3. The traveler explained how to use a camera to the head because ______. [ ]

A. the head wanted to learn how to take pictures

B. She was afraid of the head

C. She wanted the head not to worry about what she was doing

D. The head was very interested in her camera

4. Which of the following is NOT true? [ ]

A. the head was afraid that the traveler held up her camera to take pictures of the children at play.

B. The traveler didn't understand why the children shouted.

C. The traveler knew something about people in some countries.

D. The children wouldn't mind if the traveler took pictures of them.

题型:选择题

车端电连接器的基本要求是装卸方便、()、绝缘良好。

题型:选择题

皮肤表皮内有大面积的水疱,基底的细胞充血、水肿,但组织坏死仅限于真皮浅层()

A.Ⅰ度烧伤

B.浅Ⅱ度烧伤

C.深Ⅱ度烧伤

D.极重度烧伤

E.Ⅲ度烧伤

题型:选择题

腐乳按所用原料的不同,可分红腐乳、青腐乳、()。

题型:选择题

目前直接感光乳剂的反应是属于()

A.光聚合架桥型

B.光分解

C.热硬化型

D.热分解型

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